I would like to know how to get the numeric key enter button to work???

I keep getting kill & have to play the same Checkpoint many\many times...
Do I have to enter something before using numeric enter button???

I have tried defferent ways to get a cheat into the game so my team & I would not keep getting kill...

just hit the enter key on ur numbpad and type the cheat in then hit the enter key on ur alphabet side